Free Easter Egg for customer of the Leeds Building society

Just had a letter this morning from Leeds Building society offering new isa's on good friday.
They also say that on good friday they will be giving away free easter eggs to customers

"We are open Good Friday - the first day of the new tax year - open 9am to 5pm so why not call in to up your ISA? We are giving away a free Easter Egg to customers calling into the branch on that day."

So presumably its for any customers. Not just the ones opening ISA's